flux/dev/image-to-image

This documentation is valid for the following list of our models:

• flux/dev/image-to-image

Try in Playground

Model Overview

A state-of-the-art image generation model that utilizes a 12 billion parameter rectified flow transformer architecture. It is designed to generate high-quality images from textual descriptions, making it a powerful tool for developers and creatives.

Model	Generated image properties
flux/dev/image-to-image	Format: PNG Fixed size: Matches the dimensions of the reference image.

Setup your API Key

If you don’t have an API key for the AI/ML API yet, feel free to use our Quickstart guide.

API Schema

post

Body

application/json

modelstring · enumRequiredPossible values:

promptstring · max: 4000Required

The text prompt describing the content, style, or composition of the image to be generated.

num_imagesnumber · min: 1 · max: 4Optional

The number of images to generate.

Default: 1

seedinteger · min: 1Optional

The same seed and the same prompt given to the same version of the model will output the same image every time.

guidance_scalenumber · min: 1 · max: 20Optional

The CFG (Classifier Free Guidance) scale is a measure of how close you want the model to stick to your prompt when looking for a related image to show you.

num_inference_stepsinteger · min: 1 · max: 50Optional

The number of inference steps to perform.

Default: 50

enable_safety_checkerbooleanOptional

If set to True, the safety checker will be enabled.

Default: true

image_urlstring · uriRequired

The URL of the reference image.

strengthnumberOptional

Determines how much the prompt influences the generated image.

Default: 0.95

Responses

200Success

application/json

post

/v1/images/generations

cURLJavaScriptPython

curl -L \
  --request POST \
  --url 'https://api.aimlapi.com/v1/images/generations' \
  --header 'Authorization: Bearer <YOUR_AIMLAPI_KEY>' \
  --header 'Content-Type: application/json' \
  --data '{
      "model": "flux/dev/image-to-image",
      "prompt": "Add a crown to the T-rex’s head.",
      "image_url": "https://raw.githubusercontent.com/aimlapi/api-docs/main/reference-files/t-rex.png"
    }'

200Success

{
  "data": [
    {
      "url": "https://cdn.aimlapi.com/generations/hedgehog/1749730923700-29fe35d2-4aef-4bc5-a911-6c39884d16a8.png",
      "b64_json": null
    }
  ],
  "meta": {
    "usage": {
      "credits_used": 120000
    }
  }
}

Quick Example

Let's generate a new image using the one from the flux/dev Quick Example as a reference — and make a simple change to it with a prompt.

Python

import requests
import json  # for getting a structured output with indentation

def main():
    response = requests.post(
        "https://api.aimlapi.com/v1/images/generations",
        headers={
            # Insert your AIML API Key instead of <YOUR_AIMLAPI_KEY>:
            "Authorization": "Bearer <YOUR_AIMLAPI_KEY>",
            "Content-Type": "application/json",
        },
        json={
            "model": "flux/dev/image-to-image",
            "prompt": "Add a bird to the foreground of the photo.",
            "image_url": "https://raw.githubusercontent.com/aimlapi/api-docs/main/reference-files/t-rex.png",
            "strength": 0.8
        }
    )

    data = response.json()
    print(json.dumps(data, indent=2, ensure_ascii=False))

if __name__ == "__main__":
    main()

JS

Response

{
  images: [
    {
      url: 'https://cdn.aimlapi.com/eagle/files/elephant/RmRsL9NMW_kkRy6MemjZJ_ac9897dd871842e2a689b8bc24b4bf08.jpg',
      width: 1472,
      height: 512,
      content_type: 'image/jpeg'
    }
  ],
  timings: { inference: 4.4450759180035675 },
  seed: 3082066483,
  has_nsfw_concepts: [ false ],
  prompt: 'A T-Rex relaxing on a beach, lying on a sun lounger and wearing sunglasses.'
}

Reference Image	Generated Image